J/ApJ/835/113ivo://CDS.VizieR/J/ApJ/835/113doi:10.26093/cds/vizier.18350113CDSLivermore R.C.Finkelstein S.L.Lotz J.M.2019-06-05T13:45:54Z2017-10-23T08:49:10ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frgalaxiesphotometryredshiftedWe report a new analysis of the Hubble Frontier Fields clusters Abell2744 and MACS 0416 using wavelet decomposition to remove the cluster light, enabling the detection of highly magnified (>50x) galaxies a factor of 10x fainter in luminosity than previous studies. We find 167 galaxies at z>~6, and with this sample we are able to characterize the UV luminosity function to M_UV_=-12.5 at z~6, -14 at z~7, and -15 at z~8. We find a steep faint-end slope ({alpha}< -2), and with our improved statistics at the faint end we reduce the fractional uncertainty on {alpha} to <2% at z~6-7 and 4% at z~8. We also investigate the systematic uncertainty due to the lens modeling by using every available lens model individually and comparing the results; this systematic fractional uncertainty on {alpha} is <4% at all redshifts. We now directly observe galaxies in the luminosity regime where some simulations predict a change in the faint-end slope of the luminosity function, yet our results provide statistically very strong evidence against any turnover in the luminosity range probed, more consistent with simulations in which stars form in lower-mass halos. Thus, we find strong support for the extension of the steep luminosity function to M_UV_=-13 at z>6, consistent with the number of faint galaxies needed to reionize the universe under standard assumptions.2017ApJ...835..113Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/835/113CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/756/164 : UV galaxies in CANDELS from z=8 to z=4 (Finkelstein+, 2012)J/ApJ/762/L30 : CLASH: MCS J0416.1-2403 strong lensing analysis (Zitrin+, 2013)J/ApJ/793/115 : UV-continuum slopes beta for z~4-8 galaxies (Bouwens+, 2014)J/MNRAS/443/1549 : MACSJ0416.1-2403 strong-lensing analysis (Jauzac+, 2014)J/MNRAS/444/268 : HST Frontier Fields clusters (Richard+, 2014)J/ApJ/800/18 : HST/WFC3 observations of z~7-8 galaxies in A2744 (Atek+, 2015)J/ApJ/803/34 : z~4-10 galaxies from HST legacy fields (Bouwens+, 2015)J/ApJ/810/71 : UV mag of candidate galaxies at 3~<z~<8.5 (Finkelstein+, 2015)J/MNRAS/452/1437 : Abell 2744 strong-lensing analysis (Jauzac+, 2015)J/ApJ/811/29 : GLASS. IV. Lensing cluster Abell 2744 (Wang+, 2015)J/A+A/590/A31 : ASTRODEEP Frontier Fields Catalogues (Merlin+, 2016)http://archive.stsci.edu/pub/hlsp/frontier/ : Hubble Frontier Field datahttp://www.stsci.edu/hst/campaigns/frontier-fields/Lensing-Models : Frontierhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/835/113https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/835/113http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/835/113https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/835/113https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/835/113http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/835/113GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/835/113/gal (Catalog of the z~6-8 (tables 7-9))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/835/113/gal?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/835/113/gal?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/835/113/gal?GETtext/xml+votable180.050000true3.589725-30.403378060.0055555555555555566/16486 34793https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/835/113?format=asciidefaultJ/ApJ/835/113/galCatalog of the z~6-8 (tables 7-9)e_z[0.09/3.1] Negative error in z (1)stat.error;src.redshiftfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSetThe z~6 sample, z~7 sample or z~8 samplemeta.idcharIDIdentifiermeta.id;meta.maincharRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainz[5.3/8.9] Photometric redshiftsrc.redshiftfloatE_z[0.04/2]? Positive error in z (1)stat.error;stat.maxfloatnullablemu[1.2/110] Magnification (2)phot.mag;arith.ratiofloate_mu[0.1/58] Negative error in mustat.errorfloatE_mu[0/690] Positive error in mustat.error;stat.maxfloatM1500[-20.4/-12.4] Intrinsic rest-frame UV AB magnitudemagphot.mag;em.UVfloate_M1500[0.1/4.1] Negative error in M1500 (3)magstat.errorfloatE_M1500[0.2/0.8] Positive error in M1500 (3)magstat.error;stat.maxfloatASTRODEEPDisplay data from the ASTRODEEP FF catalog (Merlin+, 2016, J/A+A/590/A31) within 0.3"meta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar